Hm, let's see... There's Ouran Highschool Host Club Shugo Chara Sailor Moon Toradora Mermaid Melody Pitchi Pitchi Pitch Tokyo Mew Mew Nana
Sorry a few of those were Mahou Shoujo! I don't watch regular old Shoujo that much ^^'' I've never seen Nana, but I have heard it's one of the best Shoujo anime!
Anime related to Kaichou wa maid-sama is: Special A, But there are many good animes such as: Kamisama Hajimemashita <3 Kimi ni Todoke Lovely Complex Shugo Chara Vampire Knight Torani no Kaibutsu-kun Kaze no Stigma .